**Author details**

138 Recent Advances in Crystallography

0.1 cm2/Vs, which were 3 – 4 orders of magnitude higher than the mobilities obtained from an amorphous film of **TA-PPE** obtained by spin coating. The slow evaporation ensured good ordering of the polymer wires as shown in Figure 14. Selected Area Electron Diffraction (SAED) gave sharp diffraction peaks indicating a high level of order as manifested in the high mobility values. Thus, conditions that allow polymer units to

organize into higher order morphologies may be broadly applicable.

**Figure 14.** (a) TEM image of an individual TA-PPE nanowire (scale bar: 150 nm) and (b) its corresponding SAED pattern. (c) Schematic diagram of possible molecular packing in the onedimensional nanowires; for clarity the end-capping groups have been omitted. (Adapted with

Molecular materials with a propensity to form ordered, π-stacks have also demonstrated the ability to form crystalline molecular wires. A dianthracene diester gave crystals that packed with good π-overlap between neighboring anthracene units.59 Crystalline nanorods, when irradiated with UV light, underwent a [2+2] photopolymerzation reaction in a crystal-tocrystal type transformation. While the resulting polymer was not well suited to charge transport, the authors clearly demonstrated how single crystalline nanorods could be used to give other materials with application in organic electronics. In a similar study, a dicyanovinyl substituted anthracene molecule formed nanowires when films were cast from dichloromethane solution. These nanowires gave remarkably clear SAED patterns proving the single crystalline organization of the component molecules. Moreover, while the

permission from reference 58. Copyright 2009 American Chemical Society).

Dinesh G. (Dan) Patel and Jason B. Benedict *Department of Chemistry, State University of New York at Buffalo, Buffalo, New York, USA* 

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